Wood bending machine



A. ySOMMER WOOD BENDING MACHINE Filed Aug. 19, 1929 A .ffm/WER.

Nav. 24, 1931.

` liatented Novi. 24l 19.311'

PAT-ENT', oF

Fics

AUGUST somma, or WURTTEMBERG, GERMANY i woon BENDING MACHINE Applicationmed Apgpst 1c, 1929,' seal N o.

l The yinvention relates to Wood bending machines, andv Amoreparticularly to machines for bending wood into hoops, or ellipticalshapes, or squares .withrounded corners and )the like', and theinventlon is concerned w1thmachines ofthe kind in which thewood is bentupon a rotating mold, between which and an .abutment it is pressed.

It is usual in machines yof this kind to make f the abutment movableand'adjustableon the work table, so that it can be set according to thesize of the mold and the thickness of the Work on the mold. This entailssome inconvenience when the'mold is small, because the work is then at aconsiderable distance from the edge of the work table. vAccording to myinvention this inconvenience' is overcome by having the abutment and thework table in a fixed positional 'relation to each other, the adjustmentbeing effected by moving the mold holder` in relation to the table, orthe table .in relation to the lmold holder.`

vA machine 4ac :cording to the invention is shown in the accompanyingdrawings, in which y j Fig. 1 is a front elevation thereof,` and Fig. 2a horizontal secti'on on the line A--B Of 1.

Fig. 3 is a plan view, with workon the machine, and. v

Fig. 4 is a cross section on the line AC-D of Fig. 3.v

. The machine has a main frame 1 which, together with a top or cover tobe referred to hereinafter, constitutes the work table. rThis .mainframe 1 has fixed within it supports 2 for an inner frame 3, the latterhaving ribs 4 engaging slots in the supports 2, so that the frame 3 ishorizontally movable. L

Within the frame 3 is anl electromotor 5, which by means of a belt 6 andpulley 7 -drives a worm shaft 8, the worm 8]L engaging a worm Wheel 9 ona vertical shaft 10. The mold 11 on which the wood is bent isfixed tothe upper end of the shaft 10,' above a cover or table top12 having aslot 13 for the shaft. VFor fixing the mold to the* shaft 10 there is aspur wheel 14 on the shaft, adapted to engage o a *slotted mold holder151, the mold having a' y an internally toothed socket 15 at the. base'of ,386,945, and in 'Germany september 19, 192s@ crossbar '16 adapted tofit into the slot of the holder 151. 'The shaft 10 hole Vin the crossbar16.

A screwspindle 17/with a crank handle 18 is mounted in the frame 1, andhas thereon a rider 19. This rider is faced on one side by the verticalarm of a rectangular member 20, which is slidable in the frame 3, to alimited passes through a extent, and has upon its horizontal arm apowerful coiled buffer spring 21, placedbetween a portion of the frame 3and a collar 22 on the horizontal arm. By moving in onev direction therider, abutting against the mem-` ber 20, compresses the spring andmovesthe frame 3 inthe saine direction. On the oppo site side the'rideris faced by an abutment 23. projecting from the frame3, so that theframe 3 can also be moved in the opposite direction by the rider. vlAtvone side of the frame 1 there is a bear- .ing 24, into which can beinserted a vertical spindle 25 with a roller 26 thereon, serving asan'abutment for the-work; f

A circular mold 11 is shown,l but it will be v understood that molds ofother shapes may Y be used, e. g. elliptical molds, or square molds withrounded corners. f

For bending a laminated ring or hoop, as illustrated, the' mold 11 is,adjusted by rotating the screw spindle 17, so that the clearance betweenit and the roller 26 issubstantially 'equal to the thickness of thering.. Strips'of wood 27, cutto the proper length, are then placedbetween the mold and the roller, andV are attached at one end to themold, by means of a clamp .28. The electromotor is then started, lsovthat the mold is ,rotated by the shaft 10, and the strips of wood arebent thereon, additional clamps 28 being applied from time to time.vThere may be a clutch for starting and stopping the machine.

The screw spindle may be rotated during the bending operation, forregulating the pressure on the wood, risk of excessive pressure beingprevented by the spring 21.

On .completiongof the bending a steel hoop may be slipped on to thering, prior 4to removing the ring, with the mold,to the dryingapparatus. In the case of molds which are not circular the spindlel'?.is rotated continuous1y5`or from time to time, in the course of thebending operation, for so adjustin the mold in relation to the roller 26that t is always applied to the work.

It will be understood that alternatively the l i frame 3 may-be Xed, theframe 1 being movable in relation the frame 3-may thereto. For thispurpose be fixed to the Hoor, and the frame 1 have shorter legs. In allother respects the mechanism may be precisely the same, and theadvantage of having thebending performed at the edge of the work tableis retained.

What I claim as my invention and desire to secure by Letters Patent ofvthe United States is f In a wood bending machine the combination of awork table, an work on said table, fixed to said table, near one edgethereof, arotatable mold holder, so placed in relation to said abutment,that strips of wood heldagainst ring shape on the moldv by said abutmentduring rotation of the mold, driving mechanism for said mold holder, amovable support for said work holder and driving mechanism, and meanslncludlng a screw spindle and a buier spring for moving said support sothat said mold holder approaches said abutment.

In witness whereof I have signed this speciication. v AUGUST SOMMER.

e propel' PISSSUI'O abutment for ,thee

the mold are bent into

